Was looking at the Xtreme bullets for my 336 as a plinking load.  Does anyone have experience with these?

Looking at the 150gr bullets and rifle powders, specifically  H335.

I can't speak directly to the Marlin issue, but I shoot Xtreme 150 gr FPs  in a Uberti 1885 High Wall in .30-30.

I experimented with loads from 1200 to 1800 fps and then backed off to a load with an average velocity of 1750 fps.   I found that starting at 1800 fps I started getting fliers and it appeared that they were starting to cut or strip the plating given particles of copper that would show up on a cleaning patch.    

My preferred load in my 1885 is 20.0 gr of Alliant Reloader 7 with a CCI 500 primer and an OAL of 2.670.   The average velocity over the last several batches has been 1750 fps at 65-70 degrees, but  it picks up to about 1775 fps at 85-90 degrees, so it's about as fast as I want to go to avoid shredding the plating.  

Accuracy is quite good - with a Marbles tang sight and a Lyman 17A globe front sight, My 1885 will shoot consistent 1.5 MOA 5 shot groups at 100 and 200 yards.  

1750 fps is the velocity in a 30 inch barrel.  I get about 125 fps less in a 20" Model 94 barrel, and accuracy is not quite as good - but that's the carbine more than the bullet.  

The 1885 and the Model 94 both use 1-12 twist barrels while the Marlin 336 uses a 1-14 twist.   Consequently, assuming the bore is suitably smooth, you might be able to get a bit more velocity out of the slower twist barrel without stripping the plating off them.  I recommend using a slow burning powder to help reduce the peak pressure and reduce the initial obturation as that will probably help keep the plating intact.  In that regard H335 is not a bad choice.

Just going by memory since I can't access Google drive where I'm at I used the 150g Xtreme bullet with 31.2g of H335 and a OAL of 2.491", if  i remember correctly the bullets were going 2100 fps or so and my groups were around 2-3" because of some flyers.  When I get back home i'm going to experiment a little more with slower speeds to see if my accuracy improves.

i used my marlin 336 with a 20" barrel


****please do not use my data as i am only going by memory****

tag for info as I just came by a 336w last week and will be reloading for it at some point.

Thanks for the replies.  Wasn't sure if the microgroove barrel would be an issue as I have heard it can be with Pb bullets.