Does anyone have experience with load development for subsonic loads in this caliber?

My guess is that, when it works in 308 with fast burning pistol powder it could also work in a 260. Am I right?

The idea is to shoot with a supressor on paper targets, just for fun. In my country this is not forbidden, unlike the US

By the way, the rifle is a Rem 700 with a 24" factory barrel (soon to be replaced with a Lothar Walther 20" barrel).

It's not as simple as taking a fast powder and cutting back. Some powders can cause a big problem when reduced in the form of a stuck bullet.
Try this link for more info: http://www.hodgdon.com/data/youth/index.php

Well, Hodgdon powders is not possible to get hands on here in Norway so I'm pretty much restricted to using pistol powders from our finnish friends. If anyone have tryed Vhita Vuori N310 for subsonic loads in 260, shared experience will be much apriciated.

I could use quick load for developing load data but, I'm not sure if this could be safe enough without hearing from some with experience or knowledge in field testing first.

I sure would like my limbs to stay on for many years to come........

I've been using Blue Dot in my .223 for reduced loads; 7.5gr is about .22Mag velocities. I'm not sure how well it would work in a .260; I didn't have to use any filler in my .223 loads. So far I've gone up to 9.5gr; all the loads I've shot are with Nosler 35gr Ballistic Tips. Depending on the bullet you want to use, 4gr is about as low as you want to go.

If you're biggest worry is getting a bullet stuck in the barrel, check the bore each time you shoot. A friend of mine was loading down a muzzle-loader so his nephew could shoot it. Around 40-50gr Pyrodex, he stuck one. Pulling out a .50 cal lead bullet wasn't that difficult, and it didn't appear to hurt the rifle.

Also, check out one of the "One Caliber/One Book" for the .260; they have a lot of reduced loads using cast bullets. I went with Blue Dot for jacketed bullets, based on some of James Calhoon's .223 loads. Good luck!

I almost forgot; there's info on the 300 Whisper, and similar calibers that are creating subsonic loads, which may be usable in a .260. Check out this link; they're using Hodgdon and AA powders.

http://www.quarterbore.com/300whisper/subsonic.html

I would think a good lead bullet would be the trick for accurate subsonic loads. BTW, in't subsonic about 1000fps?