6 gt (or similar) barrel length/velocity.

[JjamesIII]

I normally figure around 35 fps loss per inch of barrel reduction. Have you found this assumption to hold true to the 6mm class of bullets? I have a threaded 26” barrel that I’m debating on cutting down to 22” for a suppressor, just considering the cost/benefits of getting it done. Or leaving the barrel as is, using a 6” suppressor.

 

[khuber84]

I have a 24" 6gt hunting buuld, running 112 barnes at 2910 with 36.4 gr H4350, my match rifles are 28" barrels, 36.5gr H4350 109lrht at 2930, different powder lot.

 

[JjamesIII]

I have a 24" 6gt hunting buuld, running 112 barnes at 2910 with 36.4 gr H4350, my match rifles are 28" barrels, 36.5gr H4350 109lrht at 2930, different powder lot.

I was thinking of taking it down to 22”. With 108’s or 105’s. Looks like I’d be in the 2850fps, which wouldn’t be terrible.

 

[Lemhi]

I’ve got a 22” lightweight hunting 6GT. My go to load is 34.5 of varget behind 110 a-tips. Runs exactly 2850. When I got my 26” PPR from GAP I tossed the same load in it just because and it chronoed 2870. Obviously the Varget is more optimal for the short barrel.

 

[JjamesIII]

I’ve got a 22” lightweight hunting 6GT. My go to load is 34.5 of varget behind 110 a-tips. Runs exactly 2850. When I got my 26” PPR from GAP I tossed the same load in it just because and it chronoed 2870. Obviously the Varget is more optimal for the short barrel.

That’s encouraging news. I have varget on hand, and that was where I am going to start with load development. Thanks for posting your experience

 

[khuber84]

I’ve got a 22” lightweight hunting 6GT. My go to load is 34.5 of varget behind 110 a-tips. Runs exactly 2850. When I got my 26” PPR from GAP I tossed the same load in it just because and it chronoed 2870. Obviously the Varget is more optimal for the short barrel.

How many rounds on the ppr at that point? If low round count, that will likely speed up 50-70fps by 200 rounds.

 

[blkqi]

I'm pushing 105s ~2800fps from a 20" barrel with a modest 33gr Varget.

 

[Lemhi]

How many rounds on the ppr at that point? If low round count, that will likely speed up 50-70fps by 200 rounds.

~50-60 rounds at that point. It’ll likely speed up a little but I’m not too worried if it doesn’t either, I’m not chasing speed.

 

[MisterOrange]

The FPS loss per inch thing isn't as drastic as traditionally assumed in all cases. I had a 6BR barrel that I cut from 25" down to 20" last year, and I lost only about 50fps total with the very same load. These little, efficient cartridges get a lot of the burning done with in a hurry. FYI I was shooting 108 Bergers at 2780fps at 25", down to 2730fps at 20" using Varget. 6GT will be similar. I also chopped a 6XC for a friend down from 23" to 19" this year, and he lost i think 60 or 80fps he said. Get it chopped, you'll be glad you did.