I was at the range this morning developing some loads for a friend who wanted 175gr TSX for his 7mm Rem Mag. When he gave me the box there was a sticker on it recommending a 1:9 twist. Remingtons have 1:9.5 twist. I figured it should be close enough. Wrong! The bullets are keyholing at 100yds, not totaly sideway but definetely yawing. I'll have to convince him that he'll have to go down to the 160gr if he wants to shoot TSX in his rifle. Anybody else had that experience with the 175gr TSX?
175gr TSX keyholing
- Thread starter bcsteve
- Start date
79-80 grains RL 25 (Alliant max) gets a 160 going 3300, so yeah-3400 should be easy with the 140. Not that I've ever done it
Re: the 175, one thing I've always wondered: are long-for-weight bullets like the TSX harder to stabilize than bullets of standard (i.e. lead core) density? Or is it purely a question of mass, and length has nothing to do with it?
I checked an online rate of twist chart and the 7mm rem mag in a rem 700 is listed as 1:9.25. I have a rem 7400 in .280 rem which has the same rate of twist. My rifle will stabilize 175 grain Hornady Interlock SP's very nicely at moderate velocity, with very nice accuracy. However I have not tried the TSX's in that grain weight. They are a really long bullet. I would think that the 160 grain TSX could do anything the 175 can, given the type of game that a 7mm rem mag is appropriate for. The high weight retension of the 160 grain TSX should make it out-penetrate a conventional jacketed 175 grain bullet.
