Tacomaj, the only differnence between the new leverloution ammo and any other 35 rem round is the bullet, the pressures and such are the same. It is perfectly safe to shoot them out of your rifle. The only issue that I have heard is that some rifles don't like to feed the last round in the tube properly, but if that is an issue with your rifle a replacement follower is available from Marlin to fix that problem. The XLRs are just a different model of your rifle but the rate of twist and chamber dimensions are the same. I haven't tried any of the leverloution ammunition yet and probably won't as for where I hunt I see no advantage to it. It will do nothing at 75 yards that the 200 grain core lokt I am currently shoot won't do. Now in some areas the added range might be a benefit but it still is not going to turn the 35 into a long range rifle. When I am hunting an area where longer shots are a possiblilty I just hunt with a different rifle but for close work the 35 is an incredible cartridge that should be far more popular than what it is, it is plenty accurate for the range it is usable at, it doesn't kick you out from under your hat or deafen you with a single shot and it kills game with boring effectiveness with very minimal meat