has anyone had experience in land and groove rifling compared to Metford,Polygonal) rifling using high speed loads.
specifically barrel wear comparison between the two.
Rifle is:
Thompson Encore 6.5-70
1-14 twist 22"
4 groove
current load is:
6.5-70
winchester 45-70 necked to .264
95gr Hornady V-Max
30.5gr H4198
~4200fps
about 1 in 3 will tear themselves apart as they come out of the barrel, barrels last me about 500 rounds before they are useless.
barrels run me around $400 a pop, found a guy who will do them in Metford for $500 if i can get 750 rounds or more through that barrel its a big savings for me.
specifically barrel wear comparison between the two.
Rifle is:
Thompson Encore 6.5-70
1-14 twist 22"
4 groove
current load is:
6.5-70
winchester 45-70 necked to .264
95gr Hornady V-Max
30.5gr H4198
~4200fps
about 1 in 3 will tear themselves apart as they come out of the barrel, barrels last me about 500 rounds before they are useless.
barrels run me around $400 a pop, found a guy who will do them in Metford for $500 if i can get 750 rounds or more through that barrel its a big savings for me.
