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Full size vs midi open gun load data.


Darthrader18

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New open gun will arrive next Friday. It's a true 5in barrel,(4.6 +.4 threads) binary eng 3 port com. I am switching up from my current open gun that has a 5.4in with binary 3 port comp. I'm loading 9.6 of no7 with a 124 fmj. I get roughly a 176pf. I'm curious how much I need to change my load for the new gun. I'll be using major pistol from shooters world. No popple holes in either. Both are 9 major. I know I need 9.8 of major pistol to get a similar load to what I have now. Curious to see what you all are using. For mid length open guns. 

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all data will need to be verified in your gun, you will find more variation between 2 barrels than the same barrel 1/2" shorter, the other day I ran 1 load in 3 of my guns there was 100fps average difference between the fastest and slowest gun

 

 

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On 3/21/2021 at 5:12 PM, Darthrader18 said:

New open gun will arrive next Friday. It's a true 5in barrel,(4.6 +.4 threads) binary eng 3 port com. I am switching up from my current open gun that has a 5.4in with binary 3 port comp. I'm loading 9.6 of no7 with a 124 fmj. I get roughly a 176pf. I'm curious how much I need to change my load for the new gun. I'll be using major pistol from shooters world. No popple holes in either. Both are 9 major. I know I need 9.8 of major pistol to get a similar load to what I have now. Curious to see what you all are using. For mid length open guns. 

You will not loose much velocity. maybe 2-3 PF if that.

 

Shoot your current load and see if you need to adjust.

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