357 Mag Loads for S&W Model 66

[lshel]

I like the Model 66 but have read/heard that the hot 125g bullet 357 mag factory loads are detrimental to the forcing cone and may stretch the frame. I don't like the recoil of these factory loads and I load for a 1100 fps to 1200 fps velocity using 357 mag nickel brass with WW standard/mag primers, Unique 7.8g for 1200 fps or A#2 6.2g for 1100 fps. The A#2 load makes the Ruger SP-101 2 1/4" and 3" manageable and accurate. I haven't shot the Unique 7.8g load in the SP-101's yet.

 

I know 158g hp 357 mag factory loads were recommended for the Model 66,  but was this due to lower factory velocity and/or more bullet contact surface. Will this reduced load in 125g Hornady XTP be less harmful or do I need a longer bullet to make more contact such as the 158g Hornady XTP? 

thanks

[Djay3]

You might want to post this on the Smith & Wesson Forum ... (good knowledge base there and helpful folks) ...

http://smith-wessonforum.com

[lshel]

I posted on S&W Forum also, thanks

[jaysouth]

If you want to shoot a lot of full pressure .357 rounds, buy a Ruger or Smith 686.  Save the 66 for carry.

[Patton]

To my understanding the concern is with the powder and powder load used to push the bullets at high velocity. At 158 grain bullet and below traveling at less than 1200fps should be good for a steady diet. Even 180gr traveling at 1400 FPS can cause issues. Also, by frequently cleaning the forcing come and barrel you can eliminate the dangers.

Really, it is a gamble with k frames. There have been stories of them having split forcing comes from just .38spl loads.

[tn hp]

5.4 grains of Titegroup, 158 grain SJHP (Zero Bullet), mixed brass, Tula SP primers. My 66s like 'em.