Hey there folks, I have spent some time working the numbers and am thinking of the design outlined below for a new (as far as I know) wild cat. From my preliminary numbers, it looks like the cartridge may fill a nitch for 1k shooters, as well as hunters like myself and possibly (though I'm not sure of the feed implications of such a design and am looking for input here too) for the AR shooters. I focused on 4 major design constraints: 1)Case capacity approximately half way or slightly more, between the .260 Rem and 6.5x.284 Winchester 2)Has to be able to function through a short action repeater, using most 139 to 142 grain bullets seated as close as possible to the junction of the neck and shoulder. If any bullet types needed to encroach on the powder space, this was to be minimized as much as possible. 3)Needs to be formable from a case that was readily available, and of very good quality 4)Utilizes a long neck to allow for greater variety of bullet weights and configurations in the 123 to 142 range if desired, while still maintaining at least .25 grip on the bullet with all desired bullets (also potential minor benefits on minimizing throat erosion) Here are the rough numbers I come up with on paper. Any feedback would be extremely appreciated as I suspect most all up here have more experience than myself on this sort of thing plus I'm doing on-paper calculations as my copy of Load From a Disk won't arrive for several days from Texas. I'm referring to it as the 6.5 SLiC (Slick Little Cartrige) and it's based on a shortened WSM case, necks turned and reamed. I plan on using the same WSM body taper as well. 6.5 SLiC Neck vol. 4.8503 gr. Shld vol. 4.8053 gr. Base vol. 52.1996 gr. Total vol. 61.8552 gr. Neck length 0.350 Shoulder Angle 35 degrees Base length excl. web 1.115 Length to neck/shldr 1.475 Case OAL 1.825 Est. Cartridge OAL 2.800 (appx. according to limited # of sample bullet measurements and depending on throating depth) ** 6.5 SLiC Usable vol. 57.00 gr. (** Usable volume was calculated as the sum of the base volume plus the shoulder volume) This should come out about right for my case capacity goal - my figures show the "Usable volume" (capacity up to the neck/shoulder junction) of comparable cartridges as follows: 6.5 WSSM Usable vol. 49.07 gr. .260 Rem Usable vol. 49.64 gr. 6.5x.284 W. Usable vol. 62.84 gr. .270 WSM Usable vol. 73.34 gr. ... so the usable volume would be 5.8 grains less than the ever-popular 6.5x.284 Winchester, with the hopes it will tread quite closely on the velocities as the case is shorter, fatter, & hopefully more efficient; it's also anticipated that having a capacity of about 6 less grains will improve the barrel life 200 to 500 rounds. Unlike the 6.5x.284, it should function well through a short action even with the longer bullets not being seated down into the boiler room. Lastly, it should give noticeably better velocities than the .260 Rem or even the .260 Rem Ackley Improved. Any feedback would be much appreciated - I'm thinking of ordering up reamers in the next couple of days so suggestions on improvements would be great! Thanks everyone for your time. I just remembered one last thing... was considering a outside neck diameter of .293 similar to the 6.5x.284 Winchester and substantially neck turning&reaming accordingly - any feedback on that dimension also would be great -thanks again! Scott L.