Seeing as your rifle was made in Spain can influence load development. When dealing with foreign rifles I like to use a holistic approach to developing a load. According to "Zen and the Art of Reloading" immersing yourself in the culture the country will produce better reloads. So Here goes
1. The evening before load development a dinner of Tapas and Sangria, flood the house with Flamenco music and make love to wife with Revels Bolero filling the room. Now you have the mindset for Bergara load development.
2. In the morning over your morning Chai contemplate the WHY of this load.
3. Upon entering the reloading area put on a Andre Segovia CD, look over your selection of bullets that work with your rifle and your WHY. Pull down your reloading manual and peruse the 22-250 load data and select a powder that is efficient and produces high velocities with the lowest pressure with the bullet you've selected.
4. Load three bullets starting at the lowest starting level and continue loading three at a time in .5gr increments, until you reach the maximum recommended charge. To determine seating depth I smoke a bullet and keep seating it gradually until the lands no longer mark the bullet and seat a smidgen(smoking bullets and smidgen measurements are old school but still effective) more.
5. Now go through the rifle checking all the scope and mounting screws, check the action screws and if the rifle barrel is free floated check that the forend doesn't hit the barrel when the weight of the rifle is pressing the forend into the rest. If not free floated either be sure the forend sits on the rest in the same place or put the back of your hand on the rest and hold the rifle. the last technique works well with pump and lever action rifles.
6. Shooting your loads, take your time, allow the barrel to cool between your three shot groups. If you see pressure signs stop there and toss the last load. Select the three most accurate loads. Don't toss out loads just because they are large, two shots touching and one an inch out may just be shooter error.
7. Load five of the three most accurate loads and return to the range. After shooting these more than likely you have very accurate load for your rifle.
PS beware of Italian rifles, Paganini and Vivaldi are addictive.
It is scary when my mind gets bored. I'm waiting for the exterminator to get here and don't want to start anything.