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Now thats a jump!

TommyD11730

Sergeant of the Hide
Full Member
Minuteman
Apr 11, 2020
392
99
Hey guys, just wondering on everyones thought on Jump.
I have a 308 rifle with a deep throat. Loading long it shoots ok if I do my part. Keeps a 5 round group under 2"s at 200. Plenty good for me.
Im considering adding a detachable mag, if nothing else ease of loading. If I do so my jump will be at least .131 . Thats a long way down vs the .023 im shooting now.
So, what do you guys think, can a deep throat rifle shoot just as good with a long jump.
Thanks!
 
I’ve loaded for and shot original M40A1’s that were so long in the throat that a Stoney Point gauge would push a 175 SMK out of the neck before it contacted the rifling. I also happened to place first in the Quantico Vintage Sniper Match with that same rifle 2 years in a row.
 
Food for thought here; Is jump proportional to bullet diameter, length, weight, etc. For example would .060 jump be considered effectively longer in a 22 cal bullet than .060 in a .308 cal bullet?
 
When i went to upgrade my 1903A3 with a weaver 2.5X scope to try vintage sniper, i measured my throat. It was stll holding about 1.5 moa with non optical match sights. Turns out the throat was .500 inches. The bullet fell out of the case. I had no idea because i had to load to the mag length and it was still shooting as good as it ever did. Go figure.

Like they said. You don’t know if you don’t try

David