I've found a front rest like the narrow (1.5" wide) Protektor leather bag will work for about 98% of sporting rifles. Even some "varmint" type stocks work well in it. Benchrest type forearms won't fit and require the next larger width bag. Using a bag that is too wide allows too much forearm movement and is worthless for accuracy work. No forearm pressure works best for me. Zeroing in this manner will also keep the point of impact the same or very close to it when shooting from a Bog Pod tripod.