| Posted: Tue May 2nd, 2006 06:55 AM |
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Reddot47
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I am having some trouble with some of my bullets catching in my mags and jambing. I carefully measure my oal with calipers and I am right on the money. The obvious solution is to shorten my oal, but, I understand I would increase the pressure in the cartridge if I do that. Can I play around with the oal a little bit and see if I can get a cartridge length that works with out building up to much pressure?
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| Posted: Tue May 2nd, 2006 08:01 AM |
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2nd Post |
caz223
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What is the source of your reloading data, or are they factory rounds?
Let me guess, midway loadMAPs?
Last edited on Tue May 2nd, 2006 08:01 AM by caz223
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| Posted: Tue May 2nd, 2006 05:59 PM |
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3rd Post |
Reddot47
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I bought Richard Lee's book on reloading.
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| Posted: Tue May 2nd, 2006 06:32 PM |
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caz223
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Find other data.
To recommend other data, I'd like to know what data you're using now, please include primer, powder type, amount, and method of dispensing, bullet weight, OAL, and bullet type.
Also, what dies may be helpful, and what press type at least, or at best the make and model of press.
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| Posted: Wed May 3rd, 2006 03:14 AM |
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caz223
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1.169" is saami max for length, and with certain profiles, it's just not the way to do it.
Anyway, I've noticed that accuracy and reliability meet, depending on weight and bullet type, usually about 1.13-1.15
Heavier 9mm bullets like 147 JHPs do best for me at 1.15"
124HP rainiers do best for me around 1.13"
I use ogive seating rather than OAL, so these are approximates.
I set my redding comp seater for 1.15 with WIN 147 grain JHPs, and load everything else with the same setting. Believe it or not, it has worked out like a charm. Normal seater dies that seat with a plug won't work like this, obviously.
The shape of the bullet would then dictate the OAL, and the die decides it for me, all I do is to scrounge up data for it.
Doing this has really helped my accuracy. I'm in the process of buying more redding competition seater dies, as they have just been amazing. (Yeah, they're pricey.)
Also, having lots and lots (And lots.) of load data sources really help. Last edited on Wed May 3rd, 2006 03:24 AM by caz223
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| Posted: Wed May 3rd, 2006 09:27 AM |
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Reddot47
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I have a Dillon 550 with their carbide dies. The bullet seating die has the insert that you flip depending if you have a round nose or semi-wadcutter type of bullet. I am loading 124 gr Montana Gold JHP, Federal small pistol primers with 4.1 gr Titegroup. That combination so far has given me the best group. I kept to Lee's specs as a starting point. I have not chronographe my loads yet. A friend of mine has a chrony and when we can get together I will start collecting that data.
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| Posted: Wed May 3rd, 2006 02:57 PM |
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armoredman
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I have to load short with my CZ - it has the infamous CZ short chamber, and will not allow onything other than FMJ at 1.169. Most of my 115gr JHP loads are at 1.083, and 124 at 1.060, per loading manual.
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| Posted: Wed May 3rd, 2006 05:00 PM |
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Reddot47
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"Most of my 115gr JHP loads are at 1.083, and 124 at 1.060, per loading manual."
Just to get this straight, are you telling me that the oal is different for different bullets? I have been looking at the diagram which gives me the dimensions of various parts of the bullet. I will recheck and see if there is some information I have been missing.
This brings up another question. If you chronograph your loads will changing the oal change the power factor because there is more or less space for the gases to expand into?
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| Posted: Wed May 3rd, 2006 07:59 PM |
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caz223
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The problem with 9mm guns is that the mags have to be short because they're mostly going to be double stack, making the grip kinda wide, but if it's too long it won't 'feel right'.
Another problem is that the bullet profiles vary wildly.
The 115 FMJ SHOULD be loaded to a different length than the 115 JHP.
Because of the feed ramp angle, and necessary shortness in the feed ram area the bullets may not feed if loaded too short, and may not reliably feed out of the mag if loaded too long. So, it's best to stay in moderation where bullet lengths are concerned. So, check your load data, do an evaluation of your gun's chamber, feed ramp, and magazine, and use your best judgement to come up with a load that's gonna be both accurate and reliable.
For example, I first started loading 9mm ammo for my cz75b. It was undersprung, and had a short chamber.
That meant to go with a medium fast powder, a middle weight flat/hollow point bullet, and load it just a bit shorter than recommended, and reduce my starting load by a common sense amount.
I added enough to insure functioning, and all was well. It was accurate anough at 1.13-1.14, using bullseye and 124 flat point rainiers. I shot and loaded a couple hundred rounds loaded this way with no problems. I thought, 'man, that was easy!'.
I then brought my H&K p7, and it jammed on those rounds, all of them. Loaded too short. It wanted hollow points with a more rounded ogive, not flat points seated deeper than normal. It loves 147 JHPs at 1.150" with a pointed style ogive, and a hard nose.
I thought 'fine, I'll shoot 'em in my sig 228' WRONG.
The 228 was NOT undersprung, and since I had not ramped up my loads to even the min. loads, the rounds that worked so well in my CZ wouldn't even cycle the slide in my 228.
Accuracy was horrible in the 228, and I found out later why that was.
It likes 'em closer to the hot side of the data, not the cold side.
You find this out by trying new stuff, as long as the load looks safe and reasonable, try it, and see what happens. Each gun is a law unto itself. There are certain common sense markers to follow, and you gotta try to keep it between the lines to keep 'er safe. There is a rumble strip to save you if you know what to look for, but it will only save you if you know what to look for, when to stop, and why some things just don't work.
Good luck!
Last edited on Wed May 3rd, 2006 08:05 PM by caz223
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Reddot47
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That answers a lot of questions that I didn't even know to ask. Thanks for taking the time to answer at length. I definitely need to do some more reading and researching.
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