Has anyone had any experience reloading the 284 winchester with RL 22 powder. Reason I am asking is that I am trying to find a load that will reach at least 2950 fps with 140 gr bullets,I am currently working with 140gr Barnes xlc bullets, I have currently worked up a load using 53.5 gr IMR 4350, it is a max load in my rifle. Average velocity is 2877fps with 26fps extreme spread and standard deviation 9.84, thats not too bad but I would like to get the velocity up a little higher. Barnes lists a starting charge of 56.5gr and a max charge of 60.5gr of RL 22, the max charge shows 3050 fps, my only problem is that I only have about 40 bullets left, after checking for pressure and chronograh testing I might not have enough to load a box unless I pull the bullets loaded with IMR 4350. I will probably have to buy a couple of boxes of 140 gr tsx's, however Barnes does not have any data regarding RL 22 and this bullet, they did inform me that I could use 150 gr XFB loading data for the tsx bullets. If anyone has any information or advice, I would appreciate it.

From the Barnes site:

1. What load data do I use for the Triple Shock Bullet?

Answer. We recommend that you use the minimum X Bullet load data to start.

To compensate for the reduced pressures associated with the Triple Shock, you may have to work up 1 to 2 additional grains above listed loads to achieve equal pressures. Pressures can jump dramatically; therefore we recommend that you work up in 1/2 gr. increments until you are no more than 1 to 2 grains above the listed max load or until signs of excessive pressure are evident. Whichever comes first. You should watch for excessive case head expansion, sticky bolt lift, flattened primers or shiny spots on the base of the case. If you have case head expansion of more than .0005″ with a once-fired case, this is a sure sign of excessive pressure. You will have to measure your case head with a Blade Micrometer just in front of the extractor groove, or you can use a regular micrometer and measure the belt on belted cases, before and after shooting. When any of these signs appear, back down one full grain and you will have a max load for your gun.

If you do not feel comfortable working up a load, or don’t have the proper equipment, then we suggest following the recommended X-Bullet load data. For the 168gr .308 cal Triple Shock Bullet, use the 165gr X-Bullet data.

Also here's some load data from Barnes on the 284 Win:

http://www.barnesbullets.com/images/284WinchesterWeb.pdf

No free lunch on working up loads, I'm afraid. It does require an investment in bullets to be done safely.