I have Ranchdogs 350 and 425 grs.
But if you want somrthing decent in a light bullet mold try RCBS they have a gas checked 300gr.
Cast Bullet Engineering here in Oz (yes they do export) have several 300grs and even a 290gr.
Hope this helps.
I have a Lee 340 grain 2 cavity plain base that shoots pretty well. If you are looking for a light plinking load use some IMR Trail Boss powder. Pretty bulky and I load it to just over 1,200 fps. for a really comfortable shoot.
My main load is with a 405 Ideal from way back, but my light slug is the same as Tom in Arizona's. The Lee 340 will come in at 350 with my softer mix and lubed 50/50 Alox/Beeswax, I use 15.7 gr of Trail Boss and get single holes of five shots at 50 yds. and it will consistantly put five in a group the size of a half dollar if I do my part at 100. Kills hogs like a cannon and is REAL EASY on the recoil. Sized down a bit and paper patched, I can drive it real fast and flat without leading. At first I hated the Lee mould as it kept falling apart, but Lee sent me a replacement (free) and it is much better. For a cheap mould with a great accruate bullet, this was a no brainer for me....Although I seldom shoot it much faster than 1450 FPS as it starts to get "Punchy" with the recoil when you get near 1550 or better...I'm a might older and I like a weapon that is fun to shoot and not kick my teeth in when I shoot! ;D