6.5x55 with SMK 142 what kind of velocity can typically be safely obtained?

[utahcybercowboy]

I am seriously considering building a 6.5x55. I have read that some claim very high velocities with this cartridge and the SMK 142. The official published loads seem to be around 2500fps and I see people claim they safely get 2900fps safely.

Any pointers on what I can safely expect to get out of a modern 6.5x55 would be appreciatted. Also what kind of velocity gain could I expect if I go Ackley Improved?

Thanks

 

[kemen4]

Hi
Try a search on here for comments by "Rhino" who has posted sensibly about most this 6.5 swede (amongst others) ... tho not for a while.

 

[Exercion]

Utah,
Much depends on your barrel, receiver, and brass. I will say that with my Rem 700, 30" Pac-Nor 3 groove stainless SM barrel, and Lapua brass, I am over 2900 using RL-22 under the Lapua 139 currently, though I used to use the 142SMK with the same velocities. No idea about the Ackley version.

Eric

 

[DukeDuke]

Same here with RL-17 and 140 a-max in a M96.

 

[jlmurphy]

The published velocities are very low due to the original loadings for small ring Mausers being in the 40,000 psi range, and Sierra for a long time used an 18" barrel in their manual. I have a Win. Model 70 with a 26" barrel, 48 grs. of H 4831 behind a Lapua 139 gr. naked Scenar gives me 2,875 fps. Re 22, being a double based powder will go faster, but I don't want to push it.

 

[utahcybercowboy]

This will be going on a Stiller Tac 300 action with a Bartlein barrel. I think if I can safely hit 2950 in the 6.5x55 I will call it good and not mess around with Ackley improved.

Anyone try Reloader 17 with this?

edited - I missed the post above with the reloader 17. Looks like I should be good to go.

 

[bluedot]

Mine is a pac nor 3 groove 28", 2997 fps 142 mk over 49.5 gr VV165, you should have no problems getting 2900+. VV165 and MRP/RL22 are the best options for those velocities.

 

[2506]

I have a sporterized Model 96 Swede Mauser that I left the original 29" barrel on it. With a max load for the small ring Mauser 96 action of 45 grs of AA4350 I get a touch over 2800 fps with the 140 Sierra. I would say with a modern action and a 28 to 30" barrel you should be able to get over 2900 fps safely.