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HELP! N320 velocity issues w/ G35


dskinsler83
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I need at least 5.0 grains, same crimp as you're using, 1.22 OAL out of my 5 inch SVI AET barrel to make major with 180 plated bullets. Here were my test velocities:

5.0 grains of VVN320 - 920, 931, 934, 929, 927

5.1 grains of VVN320 - 928, 940, 925, 937, 938

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I need at least 5.0 grains, same crimp as you're using, 1.22 OAL out of my 5 inch SVI AET barrel to make major with 180 plated bullets. Here were my test velocities:

5.0 grains of VVN320 - 920, 931, 934, 929, 927

5.1 grains of VVN320 - 928, 940, 925, 937, 938

Yeah I know bout a 2011 I loaded 5gr to make major then but I'm loading for a GLOCK as the title and OP state. Can't do long loads so thanks anyways

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I'm not suggesting you load any longer, just trying to give you a couple of data points on plated bullets and N320. Common sense would dictate that you load 10 at 4.6, 10 at 4.7 and 10 at 4.8 and try them and see if you get the velocities that you're looking for.

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I'm not suggesting you load any longer, just trying to give you a couple of data points on plated bullets and N320. Common sense would dictate that you load 10 at 4.6, 10 at 4.7 and 10 at 4.8 and try them and see if you get the velocities that you're looking for.

Correct on common sense but also common sense would say if 4.5gr is 850 and once can usually gain 20fps per .1gr then I'd have to go up to 5gr for 950fps and I'm thinking that's a lil hot for the GLOCK load considering I used 5gr at 1.180 for my custom S_I

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I would have to agree that something seems off on your chrono results. I load Berry's Plated 180's for IDPA in ESP, and I'm running 3.5 gr of N320 making 134PF out of a 5" XD. Previous chrono results for me had 3.6 gr at 138PF, and 3.8 gr at 148PF. All OALs were 1.125".

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Correct on common sense but also common sense would say if 4.5gr is 850 and once can usually gain 20fps per .1gr then I'd have to go up to 5gr for 950fps and I'm thinking that's a lil hot for the GLOCK load considering I used 5gr at 1.180 for my custom S_I

I think your estimate of 20fps per 1/10gr is a little low. In my experience depending on powder, I've seen 4-5 PF for each 1/10gr increase. You may only need a charge of 4.8gr to make major and a 2/10gr decrease for a shorter OAL in a different gun doesn't seem unreasonable to me. Each barrel is different depending on the tolerances. Even if it takes a little more powder in your barrel to make a given velocity, that doesn't mean the pressure is going to be greatly increased compared to a barrel that makes the same velocity with less powder.

Mike

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You just might have a pretty slow barrel.

I too can't get major out of my G35 stock barrel unless I load 5.2g of N320 (COL 1.140 and 180g plated frontiers) - that gives me a PF of about 175.

In fact, that load made me nervous enough to switch to N340 - of which I need 5.7g to make major with a Col of 1.135 - and even that is a lot!

I checked my chrono and the data is equal to another different make chrono, so that's sorted.

How about running your rounds through another gun over the chrono for comparison?

Clive

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Daniel, in both my Glock 35 and Glock 24 (before I switched to STI) my Lone Wolf barrels were signficantly slower than the factory. By carefully selecting magazines and loading prgressively longer, UI was able to increase my OAL to 1.141 to 1.143, With the bullet I use (Precision 185 moly) this necessitated having Lone Wolf long chamber the stainless barrels. I was using WSF at 4.6 grains.Not too far off from my STI loads with the same bullet and N-320. I did work on some loads for WSF and Winchester FMJ 180's that I worked up to a tenth at a time with the Lone Wolf barrel.

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