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Non book load data

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4seasons
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Posted: 11 May 2008 02:12 PM

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I have a question on Vihtavouri. My reloading book calls for N160, N165,or N560 to load a 155g bullet in my 260. Being that Vihtavouri is pricey and somewhat hard to find, I want to use something else. My gun really likes R-19 and being that R-19 has basically the same burn rate as N160, could I start there and work my way up or should I jump up to the 160g bullet data and load with one of the powders listed for it since the 155g shouldn't have as much pressure because of the lighter mass. Am I thinking about this right or am I completely out of line? I have never tried something that wasn't in the book.

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Posted: 11 May 2008 02:30 PM

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Easiest way to find the starting load for the RL-19 powder is just to go here:

http://data.hodgdon.com/main_menu.asp

Click on the "I Agree" button and then follow the choices until you get the info you need.

Scott (hope this helps) B

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Posted: 16 May 2008 10:13 PM

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The same burn rate does not mean the powders are eqal. Burn rate is just one specification, among many, that make a powder unique. For example, two powders may have the same burn rate, but have different densities and thus the two powders will require different weights of charges.

You should always look for data for the specific powder you are going to use with the specific bullet weight (and sometimes bullet styles) you intend to use. Before you use data offered on the internet always verify the data from 2 or 3 other sources. Our intentions are good, but sometimes we make typo errors.

If you mean RL 19, I believe the location for Alliant Powder (the ones who make RL 19) is

http://www.alliantpowder.com/reloaders/Index.htm

click on "enter the guide" then click "Centerfire Reloading Loads" then click on " the appropriate bullet weight for the data.

However, I just went to their site and they list no data for the .260 with 155 grain bullets.

None of my data lists RL 19 with 155 grain bullets in .260 Rem. Sorry!

Good luck and good shooting.

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wheezengeezer
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Posted: 16 May 2008 11:58 PM

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i4seasons wrote: I have a question on Vihtavouri. My reloading book calls for N160, N165,or N560 to load a 155g bullet in my 260. Being that Vihtavouri is pricey and somewhat hard to find, I want to use something else. My gun really likes R-19 and being that R-19 has basically the same burn rate as N160, could I start there and work my way up or should I jump up to the 160g bullet data and load with one of the powders listed for it since the 155g shouldn't have as much pressure because of the lighter mass. Am I thinking about this right or am I completely out of line? I have never tried something that wasn't in the book.if yer sayin that you can find data for the perfered powder using a 160 gr bullet and not the 155 gr powder,yer half way there.do not ASSume that a lighter bullet will mean lower pressure.if it has a higher engraving pressure ,which can be from several facters,the lighter bullet can have a higher chamber pressure.if that is the case startin at 10% less and working up should work.if you only use listed data in your loadin,you could be doin 1 or more of 3 things.missin out on the fun,using less than possible,or treadin on thin ice. aint no absolutes.

Last edited on 17 May 2008 12:01 AM by wheezengeezer

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Posted: 20 May 2008 04:03 PM

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I can't find RL-19 listed for anything over 140g so I don't know where to start there, unless I can use burn rate comparisons. However the 160g data has H1000, H4350, H4831, and H414 listed which are much easier to find (and pay for than Vihtavouri) so I though I might use the 160g start data to load some 155g and work my way up looking for presure signs, But as wheezengeezer pointed out I know nothing about engraving pressure or how much that might affect chamber pressure. Would it be more than the 10% reduction of the start load? I just want to avoid doing something stupid.

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Posted: 20 May 2008 08:05 PM

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Hi,

I,ll trie to find something in Quick-load for you if you like.

Need the complete caliber description of your rifle, the desired OAL, brand, type and weight of de bullet, same goes for the powder.

If the caliber etc. is listed in the program, I can give you a safe load to start with.

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Posted: 21 May 2008 02:11 PM

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RL19 looks to be just a tad slower than N160.10% below the max weight for N160 should be safe. and that is just my own opinion http://www.gsgroup.co.za/burnrates.html

Last edited on 21 May 2008 02:35 PM by wheezengeezer

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Posted: 21 May 2008 03:30 PM

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Paul Tummers wrote: Hi,

I,ll trie to find something in Quick-load for you if you like.

Need the complete caliber description of your rifle, the desired OAL, brand, type and weight of de bullet, same goes for the powder.

If the caliber etc. is listed in the program, I can give you a safe load to start with.
The rifle is a Ruger M77 Mark II Compact chambered in 260 Rem. I want to use RL-19 to push a Lapua Mega Bullets 6.5mm (264 Diameter) 155 Grain Soft Point seated at 2.800 OAL.

I have never heard of this program before and did a search and found a screen shot. Looks like it requires alot of info that I don't have on hand unless it is preprogramed with alot of specs. I appreciate the help.

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Posted: 21 May 2008 08:31 PM

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Cal. 260 Rem.

powder Alliant Reloader 19

Internal case volume assumed 53.50 grain H2O

Case length 2.030

OAL 2.800

Lapua Mega 155gn E471

Min. load 40 gn, load density 92.6%, V0=2346 fps, P=44662 psi

Max.load43 gn, load density99.5%, vo=2525fps,P=55599 psi

Assumed barrel length is 20 inch

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Posted: 22 May 2008 02:34 PM

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Thanks Paul.

Barrel length is actually 16.5 in but that should only affect velocity, Right?

Paul Tummers
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Posted: 22 May 2008 07:57 PM

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You are right!!

Good,luck!!

Paul T.

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Posted: 24 May 2008 01:06 PM

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I appreciate all the help. Today I hit the range and see how we did.

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Posted: 24 May 2008 01:54 PM

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I want to see pictures of your targets of course!!!!!! :wink:

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Posted: 20 October 2008 11:33 PM

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Well I finally got back to my hunting load project. Things got kinda hectic around here, with having a baby, then my scope went haywire, then my bow string snapped 2 weeks before bow season. So now that Burris has sent me a new scope after a failed attempt to fix mine, I finally did some range work this weekend. I helped my father-in-law with his 30-06 and 300 win mag, as well as my muzzle loader and 260 sending over 200 bullets down range I learned a few things.
First, my shoulder hurts :baby:

Second, my father-in-laws rifles and my 260 love RL-19
Third, the 155 grain 6.5mm Lapua bullets don't chamber properly in my rifle.
The best I can figure the round nose on these bullets sits the ogive so far forward that I cant get anywhere close to the min OAL. I only had enough powder to load a few at 40 grains. They shot 5 shots at 150 yards about an inch so I was pretty happy. I will post some pics as soon I figure out how. I though while I was at the range my gun was so dirty that the bolt was getting hard to close but after a good cleaning I tried again and realised that I was seating the bullets deeper with the bolt.
When I measured the bullet in my chamber it contacts the rifling at 2.635 OAL.
So my question is how safe is playing with OAL? I assume it affects presure in the shorter the OAL the less space in the chamber therefore the higher the presure. How much more presure though. Nothing in my book shows any bullet with an OAL this short. I checked for presure signs and saw none but I am worried about building on to many variables.

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